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Hybridization of Russian Sturgeon (Acipenser gueldenstaedtii, Brandt and Ratzeberg, 1833) and American Paddlefish (Polyodon spathula, Walbaum 1792) and Evaluation of Their Progeny

1
National Agricultural Research and Innovation Centre, Research Institute for Fisheries and Aquaculture, H-5540 Szarvas, Hungary
2
Festetics György Doctoral School, Georgikon Faculty, University of Pannonia, H-8360 Keszthely, Hungary
3
Juhász-Nagy Pál Doctoral School of Biology and Environmental Sciences, University of Debrecen, H-4031 Debrecen, Hungary
4
Animal Husbandry Science Doctoral School, Szent István University, H-2100 Gödöllő, Hungary
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Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, H-4032 Debrecen, Hungary
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Doctoral School of Molecular Cell and Immune Biology, University of Debrecen, H-4032 Debrecen, Hungary
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Department of Aquaculture, Institute for Conservation of Natural Resources, Faculty of Agricultural and Environmental Sciences, Szent Istvan University, H-2100 Gödöllő, Hungary
8
School of Aquaculture and Aquatic Sciences, Kentucky State University, Frankfort, KY 40601, USA
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Department of Animal Science, Georgikon Faculty, University of Pannonia, H-8360 Keszthely, Hungary
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National Centre for Biodiversity and Gene Conservation, Institute for Farm Animal Gene Conservation, H-2100 Gödöllő, Hungary
*
Author to whom correspondence should be addressed.
These authors contributed equally.
Genes 2020, 11(7), 753; https://doi.org/10.3390/genes11070753
Received: 21 May 2020 / Revised: 29 June 2020 / Accepted: 3 July 2020 / Published: 6 July 2020
(This article belongs to the Special Issue Fish Cytogenetics: Present and Future)
Two species from the families Acipenseridae and Polyodontidae, Russian sturgeon (Acipenser gueldenstaedtii, Brandt and Ratzeberg, 1833; functional tetraploid) and American paddlefish (Polyodon spathula, Walbaum 1792, functional diploid) were hybridized. The hybridization was repeated using eggs from three sturgeon and sperm from four paddlefish individuals. Survival in all hybrid family groups ranged from 62% to 74% 30 days after hatching. This was the first successful hybridization between these two species and between members of the family Acipenseridae and Polyodontidae. Flow cytometry and chromosome analysis revealed two ploidy levels in hybrids. The chromosome numbers of the hybrids ranged between 156–184 and 300–310, in “functional” triploids and “functional” pentaploids, respectively. The hybrid origin and the ploidy levels were also confirmed by microsatellite analyses. In hybrids, the size and the number of dorsal and ventral scutes correlated with the ploidy levels as well as with the calculated ratio of the maternal and paternal chromosome sets. An extra haploid cell lineage was found in three hybrid individuals irrespective of the ploidy level, suggesting polyspermy. Although the growth performance showed high variance in hybrids (mean: 1.2 kg, SD: 0.55), many individuals reached a size of approximately 1 kg by the age of one year under intensive rearing conditions. View Full-Text
Keywords: ploidy level; morphology; chromosome number; paternal haploid cell lineage; sturgeon ploidy level; morphology; chromosome number; paternal haploid cell lineage; sturgeon
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Káldy, J.; Mozsár, A.; Fazekas, G.; Farkas, M.; Fazekas, D.L.; Fazekas, G.L.; Goda, K.; Gyöngy, Z.; Kovács, B.; Semmens, K.; Bercsényi, M.; Molnár, M.; Patakiné Várkonyi, E. Hybridization of Russian Sturgeon (Acipenser gueldenstaedtii, Brandt and Ratzeberg, 1833) and American Paddlefish (Polyodon spathula, Walbaum 1792) and Evaluation of Their Progeny. Genes 2020, 11, 753.

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